Results 11 to 20 of about 2,947,979 (285)
A New Stall-Onset Criterion for Low Speed Dynamic-Stall [PDF]
Journal of Solar Energy Engineering, 2005 The Beddoes/Leishman dynamic-stall model has become one of the most popular for the provision of unsteady aerofoil data embedded in much larger codes. The underlying modeling philosophy was that it should be based on the best understanding, or description, of the associated physical phenomena.
Sheng, W. +2 more
openaire +3 more sources
Time scales of dynamic stall development on a vertical-axis wind turbine blade [PDF]
Flow, 2023 Vertical-axis wind turbines are excellent candidates to diversify wind energy technology, but their aerodynamic complexity limits industrial deployment.
Sébastien Le Fouest +2 more
doaj +2 more sources
Dynamic stall development [PDF]
Experiments in Fluids, 2013 Dynamic stall on an oscillating airfoil was investigated by a combination of surface pressure measurements and time-resolved particle image velocimetry. Following up on previous work on the onset of dynamic stall (Mulleners and Raffel in Exp Fluids 52(3):779–793, 2012), we combined time-resolved imaging with an extensive coherent structure analysis to ...
Mulleners, Karen, Raffel, Markus
core +4 more sources
Dynamic Stall of a Vertical-Axis Wind Turbine and Its Control Using Plasma Actuation
Energies, 2019 In this paper, a dynamic stall control scheme for vertical-axis wind turbine (VAWT) based on pulsed dielectric-barrier-discharge (DBD) plasma actuation is proposed using computational fluid dynamics (CFD).
Lu Ma +3 more
doaj +3 more sources
Control of rotorcraft retreating blade stall using air-jet vortex generators [PDF]
, 2006 A series of low-speed wind tunnel tests were carried out on an oscillating airfoil fitted with two rows of air-jet vortex generators (AJVGs). The airfoil used had an RAE 9645 section and the two spanwise arrays of AJVGs were located at x/c=0.12 and 0.62.
Kokkalis, A. +5 more
core +9 more sources
Dynamic stall on a fully equipped helicopter model [PDF]
Aerospace Science and Technology, 2012 Abstract Three-dimensional dynamic stall was observed on the rotor of a fully equipped subscale helicopter model in a wind tunnel. Results of stereoscopic particle image velocimetry measurements on the retreating blade clearly revealed the large-scale dynamic stall vortex at 50% and 60% blade radius.
Markus Raffel, Karen Mulleners
exaly +2 more sources
Development of a second-order dynamic stall model [PDF]
Wind Energy Science, 2020 Dynamic stall phenomena carry the risk of negative damping and instability in wind turbine blades. It is crucial to model these phenomena accurately to reduce inaccuracies in predicting design driving (fatigue and extreme) loads. Some of the inaccuracies
N. Adema, M. Kloosterman, G. Schepers
doaj +5 more sources
HAWT performance with dynamic stall [PDF]
, 1986 In this report we calculated the effects of flow nonuniformities (wing shear, tower wake, yaw, and large-scale turbulence) on the performance of a horizontal axis wind turbine, accounting for dynamic stall. We modified the PROP program to incorporate and compare these effects with the uniform flow case.
Hibbs, B. D.
openaire +4 more sources
Detection of vaneless diffuser rotating stall by means of dynamic pressure sensors and acoustic measurements [PDF]
E3S Web of Conferences, 2021 An accurate estimation of rotating stall is one of the key technologies for high-pressure centrifugal compressors. Several techniques have been proposed to detect the stall onset; inter alia, few dynamic pressure probes have been shown to not only ...
Romani Luca +6 more
doaj +1 more source
Effect of dynamic stall on the aerodynamics of vertical-axis wind turbines [PDF]
, 2011 Accurate simulations of the aerodynamic performance of vertical-axis wind turbines pose a significant challenge for computational fluid dynamics methods.
Scheurich, Frank, Brown, Richard
core +4 more sources